Multiple engine power plant



April 2, 1947. H. T. WOOLSON HAL 2,419,305

MULTIPLE ENGINE POWER PLANT Filed Dec. 17, 1942 9 Sheets-Sheet 1 INVENTOR HARRY 1'. WOOLSON me gounue CARPENTIER Maw/mm AT'TORNEYS April 22, 1947. WOOLSON HAL 2,419,305

MULTIPLE ENGINE POWER PLANT Filed Dec. 17, 1942 9 Sheets-Sheet 2 INVENTOR HARRY T. WOOLSON a MElBYOURNE L.CARPENT|ER ATTORNEYS April 1947 H. T. WOOLSON ETAL MULTIPLE ENGINE POWER PLANT 9 Sheets-Sheet 3 Filed Dec. 17, 1942 HARRY T. V I EQO N Q MEE$URP L. CARPENTIER ATTORNEYS April 22, 1947. H. T. WOOLSON EI'AL 2,419,305

MULTIPLE ENGINE POWER PLANT Filed Dec. 17, 1942 9 Sheets-Sheet 4 l E T HARRY T. VBXLEN E MELBOURNE L. CARPENTER .744, r2126 $4 M ATTORNEYS FIG. 6

April 22, 1947. T. WQOLSON ETAL 2,419,305

MULTIPLE ENGINE POWER PLANT Filed Dec. 17, 1942 9 Sheets-Sheet 5 INVENTOR RY T. WOOLSON MEL BQURNE L. GARPENTIER new, Edi/ 5 ATTORNEYS April 22, 1947. H. 'r. WOOLSON EIAL 2,419,305

9 Sheets-Sheet 6 April 22, 1947.

H. T. WOOLSON ET AL MULTIPLE ENGINE POWER Filed Dec.

PLANT 1942 9 Sheets-Sheet '7 ZIB l V TOR HARRY r wo'3LE u a MELBOURNE L. CARPENTIER ATTORNEYS 1942 9 Sheets-Sheet 8 H. T. WOOLSON ET AL MULTIPLE ENGINE POWER PLANT Filed Dec.

April 22, 1947.

l VENTOR HARRY T. w $0Ls0N B MEEQPURNE L. CARPENTER ATTOR N EYS April 22, 1947. woo so ETAL 2,419,305

MULTIPLE ENGINE POWER PLANT Filed Dec. 17, 1942 9 Sheets-Sheet 9 INVENTO HARRY 1'. WOOLSON MELBGJRNE L. CARPENTIER ATTORNEYS Patented Apr. 22, 1947 UNITED STATES PATENT OFFICE MULTIPLE ENGINE POWER PLANT Harry T. Woolson and Melbourne assignors to Chrysler Corpora- Detroit, Mich.,

L. Carpentler,

tion, Highland Park, Micln, a corporation of Delaware fiClaimc. 1

This invention relates to multiple engine power plants, and particularly to a power plant which comprises a. number of high production, small horsepower engines assembled on a common crankcase.

It is the prime object of the invention to provide a relatively high power output power plant by combining a number of small engines. Tooling for production of large internal combustion engines is an expensive procedure, particularly in cases where a. comparatively small number of engines are required. In times of national emergency it may be impossible to obtain tools for manufacturing a new design of engine. The. present invention contemplates the use of conventional automobile engines which are easily produced in large quantities and for which production equipment is always available.

By means of our invention it is possible to assemble a number of automobile engines into one large power plant which is light, compact, accessible, easy and cheap to produce, and eiilcient. Earlier efforts to achieve these results by connecting a number of complete engines in series or parallel through gears, shafts or belts have not been satisfactory because of the excessive bulk and weight of the power plant.

In the arrangement about to be disclosed by way of example, five regular production automobile engines complete except for crankcase are assembled on a common crankcase in circumferentially spaced relation. This arrangement provides an exceedingly compact power plant which resembles a radial engine in appearance.

Referring to the drawings:

Fig. 1 is a side elevation of the power plant.

Fig. 2 is an end elevation of the same, the front end being shown.

Fig. 3 is a front elevation of the same taken as indicated by the arrow in Fig. 1.

Fig. 3A is an elevational view of the throttle linkage looking in the direction of the arrows in Fig. 3.

Fig. 4 is a sectional view along the line 4-4 of Fig. 1.

Fig. 5 is a section along line 5-5 of Fig. 1.

Fig. 6 is a section along line 6--8 of Fig. 1.

Fig. 7 is a rear elevation of the power plant.

Fig. 8 is a fragmentary rear elevation showing the cooling system.

Fig. 9 is a longitudinal vertical section taken as indicated by the line 9-9 on Fig. 3.

Fig. 10 is a horizontal section taken as indicated by the line li-iil in Fig. 9.

Fig. 11 is a section taken along the line ll-| l of Fig. 10.

Fig. 12 is a section taken along line l2-l2 of Fig. 10.

Fi 13 is a section taken along line "-43 of Fig. 10.

Fig. 14 is a section along line ll-ll oi Fig. 9.

Fig. 15 is a section along line lS-ll of Fig. 14.

Fig. 16 is a rear elevation of a modified form of power plant.

Fig. 17 is a section taken along line ll-il oi Fig. 16.

Fig. 18 is a section taken along line lG-IB 0! Fig. 16.

As can be seen from Figs. 1 to 7 inclusive, the power plant comprises a central crankcase III which is provided with the radially disposed openings El, 52, 53, 54. 55 and 56. These openings are elongated longitudinally of the case and all but ii are adapted to receive the crankshaft and associated parts of an engine assembly as is illustrated in Figs. 5 and 6. The engine assemblies, designated A, B, C, D and E respectively, are complete except for crankcases and are substantially regular production automobile engines.

The engine blocks 51. 58, 59, ill and Bi are secured to the case 50 by hold-down bolts 62 and the engines are arranged in radial circumierentially spaced relation with respect to the longitudinal central axis of the case, the spacing being such that the engines and their accessories are readily accessible.

It will be noted that the central crankcase ill comprises a structure having a T-shape. of which the sides or the leg of the T are inwardly inclined to the vertical when considered in an upward direction, and the ends of the crossbar oi the T are inwardly inclined to the vertical to a slightly greater extent when considered in an upward direction. Thus engines 51 and Bi are relatively closely spaced from one another and extend in opposite directions at angles inclined somewhat above the horizontal from the sides of the legs of the T; engines 58 and B0 are relatively widely spaced from one another and extend in opposite directions at angles inclined to a somewhat greater extent above the horizontal from the ends of the crossbar of the T: and engine 59 extends upwardly from the crossbar of the 1'. With this arrangement no engine extends downwardly, and in fact all engines extend upwardly to some extent. The result is that all the engines are used in positions that are at least somewhat similar to the positions for a regular production automobile engine, which each of these engines is. Thus the lubrication and cooling of the engines are not disturbed. Furthermore, the overall vertical dimension of the entire assembly is held to a minimum. If the engines simply extended radially from the central crankcase like the spokes of a wheel, some of the engines would be downwardly inclined, thereby causing complications in the cooling and lubrication, and the overall vertical dimension would be considerably increased. In spite of the arrangement of engines, one extending upwardly, two extending generally horizontally in one direction, and two extending generally horizontally in the opposite direction, the engines are satisfactorily spaced about the central structure 50 so that, as seen in Fi 4, the engine driven gears are relatively well spaced about the central driven gear in balanced relation, and thus a satisfactory loading is established.

The opening at the bottom of the case 50 is covered by an oil pan 63, and an oil pump I34 (Fig. 9) is provided at this location for distributing oil under pressure to each of the engines as will be described.

Each engine is provided with its own fuel induction system including carburetors 64, 65, 66, 51 and 60 which are supplied from a fuel pump 69 (Fig. 1) through flexible fuel lines 10, 1| and 12. The lines 10 and 12 are provided with T-connections 13, 14 respectively so that these lines can feed two carburetors. The pump 69 is connected to a fuel tank (not shown) by a pipe 15.

The exhaust from each engine is connected by means of suitably formed manifolds 16, 11 (Fig. 7) to a single muffler (not shown).

All of the carburetor throttle valves are interconnected by a linkage as shown in Figs. 3 and 3A. The link 16 connects carburetor 61 with 53; link 19 connects 66 with 61: link 60 connects 65 with 68, and link 8i connects 64 with 65. Carburetor 65 is provided with bellcrank 33 which connects through a link 82 with the accelerator pedal or other control (not shown) through a bellcrank 93 and link 94. A throttle return spring 95 is suitably connected to lever 93 as shown in Fig. 3A.

The various carburetor choke valves are similarly interconnected by links 04, 35, 96, 31 and 66, and rockshaft 69 which is suitably mounted on the power plant by support members 90, 9I as shown. The shaft is rocked by means of a link 92 which is connected to a choke lever (not shown) for convenient manipulation by the operator.

The crankcase 50 is open at the forward end and a cover plate 96 (Figs. 2, 3, 4 and 9) is detachably secured thereto by studs 91. The cover 96 carries five stationary stub shafts 96, 99, I00, IM and I02 on which are journaled gears I03, I04, I05, I06 and I01 respectively. These gears are respectively disposed in substantial alignment with the crankshafts of the five engines to which they are drivingly connected.

Fig. 9 illustrates the connection of the gear I05 to the crankshaft I08 of engine C and the other connections are identical. The crankshaft I06 carries an externally toothed element I09 which is bolted to the forward flange thereof by bolts H0. The element I09 fits within and engages an internally toothed element III which is in turn carried by an externally toothed element II2 bolted by bolts I I3 to the gear I05. This coupling means compensates for any misalignment which may exist between the crankshaft and the gear.

The gears I03 to I01 mesh with a centrally disposed gear I I4 carried by a stub axle H5. The latter is rigidly journaled in a central boss H6 and constitutes the output shaft of the power 4 plant. A double row ball hearing I I1 and a single row ball bearing I I9 rotatably rigidly support the axle H5 in the boss. The gear H4 is splined on the axle I I5 as illustrated in Fig. 9 and is retained thereon by a nut I I9. A similar nut I20 abuts the bearing H1 at the forward portion of the axle.

The boss H6 is closed at the forward end by a cover I2I, a suitable seal I22 being provided to exclude dust and dirt.

The axle H5 is internally splined at its rear end for the reception of a shaft I23 the rear end of which is journaled in a member I24. The latter is secured to an inte rally cast rib I25 (Figs. 5 and 9) which forms the upper boundary of the main oil pressure chamber I26.

The shaft I23 carries a pair of bevel gears I21, I26 which mesh respectively with the bevel gears I29, I30 carried respectively by the shafts I3I, I32. The shaft I3I drives a scavenging pump I33 and the shaft I32 drives a pressure pump I34. These pumps are located in the lowest portion of the crankcase as will be further described.

A shaft I35 connects the shaft I23 with the fuel pump 69 through a flexible joint I36.

A timing chain sprocket I31 is formed on each crankshaft near the rear end thereof for drivin each of the cam shafts I36. 0n the extreme rear end of the shafts I06 a combined vibration damper and pulley is mounted. These are designated I39, I40, I4I, I42 and I43 (Figs. 7 and 9). The pulley I39 of engine A drives a water pump drive pulley I45 through a belt I44. The pulleys I4I, I42 and I43 likewise drive the water pump pulleys I46, I41 and I46 of engines C, D and E through belts I49, I50 and I5I respectively. The pulley I40 of engine B drives a water pump pulley I52 through a belt I53 which in addition drives a generator pulley I54 of an electric generator I55. The latter is the electrical supply of the power plant.

Each of the engines has its own distributor which are designated I56, I51, I56, I59 and I60 in Figs. 1 to 7. These distributors supply the spark plug sets on the various engines through wiring in the usual manner as illustrated in Fig. 1.

The conduits of the cooling system for supplying the various engine units are illustrated in Figs. 1, 2 and 8, it being noted that each of the units has its own individual water pump. Referring to Fig. l which illustrates the radiator and connections, the radiator has a core I6 I, an upper tank I62 and a lower tank I63. The coolant fluid is circulated by the water pumps I64, I65, I66, I61 and I66 (Fig. 8) from the lower tank I63 through conduit I69 to engines A, B and C. A similar conduit I10 on the left side of the power plant (as viewed from the front) conducts the fluid to engines D and E.

The coolant after passing through the blocks of engines A and B is returned to the upper radiator tank I62 through conduits I1I, I12; the engine B having a special head connection I13 for accommodating the flow. Likewise the coolant from engines D and E is returned to the tank I62 through conduits I14. I15 and that from engine C through conduit I16.

As can be seen from Fig. 8, the high points of the water pumps are interconnected by a system of piping designated generally by the numeral I11, suitable T-connectors being provided where necessary. This arrangement prevents formation of a vacuum in the system which might leave one or more of the engines without coolant.

Referring now to Figs. 9 to 15, it may be seen that the scavenger and pressure pumps I33 and I34 respectively are gear pumps of the S-gear type. The pressure pump I34 has a central drive gear I18 and driven gears I19, I80. The two suction ports Ill and I62 are open to the main suction conduit I93 which is connected by a. hose I84 with the main oil cooling reservoir (not shown). The two are bridged by a passage I06 as shown in Figs. 9 and 12.

The two pressure ports I88 and I81 are bridged by a passage I80 which leads into the main oil gallery I90 by way of passage I89. A bleed passage I9I leads from port I86 to a hydraulic motor I92 which drives an oil filter I93. A return passage I94 returns this oil to the sump. A spring loaded pressure relief valve I95 of known type is provided to relieve the pressure across the pump in the event of an overload.

The gears I21, I 20. I29, I30 and their associated bushings are lubricated by oil which flows upwardly through passage I96 into chamber I26. The driving parts of the pumps I33 and I34 receive lubricant through the passages I96 and I91.

The main oil gallery I90 connects with an annular chamber I96 (Figs. 6 and 9) which chambar in turn connects with a series of passages I99, 200, 2M, 202 and 203 which are formed in the crankcase 50 at the time of casting. These passages (which are shown in Fi 6) connect with the regular oil passages of the engine blocks, designated 204, 201, 208, 209 and 2 I respectively. These engine o l passages are connected with the crankshaft bearings and other parts of the engine needing lubrication in the manner well known in the art. Some of these connecting passageways are shown in the drawing. For example, numeral 205 designates the main oil gallery of engine A and 206 designates an oil passage which conducts oil from the gallery to a crankshaft bearing. Numerals 2H and 2I2 indicate similar passages in the block of engine C. The main oil gallery 2" of engine C (see Fig. 9) has an outlet 2I3 at the forward end of the block which feeds a spray of oil to the gears I85, etc. Engines B and D have similar outlets.

The lubricating oil returns to the sump by way of the openings 2I4, 2I5, 2I6, 2" (Figs. 5 and 9) where it passes through the screen 2l8 and is picked up by the scavenger pump I33.

The scavenger pump suction ports 225, 226 are independent of each other and connect respectively with either end of the sump pan by means of passages 221 and 228. The pump is thus able to exhaust the sump into the reservoir even though the power plant is tipped at an extreme angle. At such times that the plant is tipped over so that oil is being taken In at only one suction port, one side of the pump is required to handle the entire oil flow. For this reason the scavenger pump I33 is twice as large as the pressure pump I 34 and has twice the pumping capacity.

The scavenger pump presssure ports 229, 230 are bridged a passage 23I which is open to a passage 232 which leads to the power driven filter I93. From the filter the oil goes to the reservoir through a pipe 233 (Fig. 10). A by-pass valve 234 of the spring loaded variety permits direct flow around the filter should the passages thereof become clogged. The hydraulic motor I92 rotates a rotary filter element 235 at a very slow rate, approximately one revolution per minute. A fixed element 236 acts as a scraper and continually cleans the filtering passages.

If the screen 2"! becomes clogged, the oil level in the sump will rise and the pressure pump I33 6 will be fed by the by-pass passageway 231 (Fig. 13) which by-passes the screen.

Referring now to Figs. 16, 1'1 and 18, which illustrate modifications of the structure lust described, Fig. 16 shows an arrangement wherein one large coolant pump 250 replaces the individual small pumps of the engines. This arrangement results in simplification of the piping and eliminates the tubing I11.

The pump 250 is located at the rear end of the power plant and is driven by the accessory drive shaft I35 (Fig. 1'1). The pump drive shaft 25I is connected to the shaft I35 by means of a coupling sleeve 252 and is suitably journaled in the rear face of the crankcase casting by means of a Journal member 253. A pump impeller 254 supplics coolant under pressure to a pressure manifold 255 from which it is distributed to the various engine units through pipes 256, 251, 258, 259 and 260. A pair of suction pipes 26I, 262 connect the inlet manifold 263 with the bottom radiator tank.

This arrangement of the coolant system necessitates relocating the fuel pump. Figs. 16 and 18 show the fuel pump 69 as being driven by the timing gear 264 of engine E, a, pump drive gear 265 being keyed on the drive shaft 266 for meshing therewith. The fuel pump may, of course, be driven from any of the other engine units.

The power plant is adapted to be supported at the front end by arms 210. 2". These arms are preferably castings, shaped as shown in Fig. 2. and are bolted to the front cover 96. The rear support comprises a bracket 212 (Figs. 1 and '7) secured to the rear face of the crankcase. It may thus be seen that a three point suspension is provided.

The output shaft II5 carries the flywheel and clutch as illustrated in Figs. 1 and 2, these units being disposed forwardly of the radiator core I6 I. The flywheel 213 carries a cooling fan 214 and a ring gear 215. The latter is adapted to be engaged by a pinion 216 of a starting motor 211 for starting the power plant, all of the engines being started simultaneously.

It is to be understood that preferred embodiments of our multiple engine power plant have been described and that changes in the size, arrangement and number of en ine units, and parts may be made by those skilled in the art without departing from the spirit of our invention.

We claim:

1. A multiple unit power plant comprising a central structure of approximate T-shape, a plurality of engines secured to and extending outwardly from the central structure, one engine being secured to the top of the crossbar of the T, two engines being secured to the ends of the crossbar of the T, and two engines being secured to the opposite sides of the leg of the T, a drive shaft mounted in the central structure, and means drivingly connecting the engines with the drive shaft.

2. A multiple unit power plant comprising a central structure, first and second engines relatively narrowly spaced from one another and extending from opposite sides of the central structure adjacent the base thereof at angles inclined slightly above the horizontal, third and fourth engines relatively widely spaced from one another and extending from opposite sides of the central structure adjacent the top thereof at angles slightly inclined above the horizontal, a fifth engine extending upwardly from the top of the central structure, a drive shaft mounted in the 7 central structure, and mean drivingly connecting the five engines with the drive shaft.

3. A multiple unit power plant comprising a central structure of T-shape, first and second engines secured to and extending in opposite directions generally horizontally from opposite sides of the leg of the T, third and fourth engines secured to and extending in opposite directions generally horizontally from opposite ends of the crossbar of the T, a fifth engine secured to and extending upwardly from the top of the crossbar of the T, a drive shaft mounted in the central structure, and means drivingly connecting the five engines with the drive shaft.

4. A multiple unit power plant comprising a central structure of approximate T-shape having the sides of the leg inclined to the vertical when considered in an upward direction and the ends of the crossbar of the T inwardly also inclined to the vertical but at a somewhat greater angle when considered in an upward direction, first and second engines secured to and extending in opposite directions from the sides of the leg of the T at angles somewhat above the horizontal. third and fourth engines secured to and extending in opposite directions from the ends of the crossbar of the T at somewhat greater angles above the horizontal, a fifth engine secured to and extending upwardly from the top of the crossbar of the T, a drive shaft mounted in the central structure, and means drivingly connecting the five engines with the drive shaft.

5. A multiple unit power plant comprising a central structure, a. driveshaft mounted within the central structure, a plurality of engines, each engine including a reciprocative piston and a crankshaft driven thereby, the engines being connected with the central structure so that the crankshafts are connected with the drlveshaft and spaced thereabout through more than 180 and the pistons reciprocate along lines all on one side of a. given line and away from the given line when considered in directions from the crankshafts to the respective pistons.

6. A multiple unit power plant comprising a central structure, first and second engines secured to and extending outwardly from one side of the central structure in generally parallel relation, third and fourth engines secured to and extending outwardly from the opposite side of the central structure in generally parallel relation, the first and third engines being directly opposite one another and being relatively closely spaced, the second and fourth engines being directly opposite one another and being relatively widely spaced, and a fifth engine extendin from a region of the central structure located generally between the second and fourth engines and on the side away from the first and third engine, a. drive shaft mounted in the centra1 structure, and means drivingly connecting the engines with the drive shaft.

HARRY T. WOOLSON. MELBOURNE L. CARPENTER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Certificate of Correction Patent No. 2,419,305.

Number Name Date 1,354,535 Cofi'man Oct. 5, 1920 1,815,868 Schenk July 21, 1931 2,115,660 Yingling Apr. 26, 1938 1,933,292 Woolson Oct. 31, 1933 1,912,507 Woolson June 6, 1933 2,310,220 De Michelis Feb. 9, 1943 1,031,131 MacFarren July 2, 1912 1,101,308 Mcsweeney June 23, 1914 1,466,321 Whitcomb Aug. 28, 1923 FOREIGN PATENTS Number Country Date 123,229 British 1919 392,282 British 1933 675,425 French 1930 842,773 French 1939 533,491 French 1922 April 22, 1947.

HARRY T. WOOLSON ET AL. It is hereby certified that error appears in the rinted specification of the above numbered patent requiring correction as follows:

olumn 5, line 62, after the word brid ed insert by; and that the said Letters Patent should be read with this correcrtion t crew that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 12th day of August, A. D. 1947.

LESLIE FRAZER,

First Assistant Oommiast'oner of Patents.

7 central structure, and mean drivingly connecting the five engines with the drive shaft.

3. A multiple unit power plant comprising a central structure of T-shape, first and second engines secured to and extending in opposite directions generally horizontally from opposite sides of the leg of the T, third and fourth engines secured to and extending in opposite directions generally horizontally from opposite ends of the crossbar of the T, a fifth engine secured to and extending upwardly from the top of the crossbar of the T, a drive shaft mounted in the central structure, and means drivingly connecting the five engines with the drive shaft.

4. A multiple unit power plant comprising a central structure of approximate T-shape having the sides of the leg inclined to the vertical when considered in an upward direction and the ends of the crossbar of the T inwardly also inclined to the vertical but at a somewhat greater angle when considered in an upward direction, first and second engines secured to and extending in opposite directions from the sides of the leg of the T at angles somewhat above the horizontal. third and fourth engines secured to and extending in opposite directions from the ends of the crossbar of the T at somewhat greater angles above the horizontal, a fifth engine secured to and extending upwardly from the top of the crossbar of the T, a drive shaft mounted in the central structure, and means drivingly connecting the five engines with the drive shaft.

5. A multiple unit power plant comprising a central structure, a. driveshaft mounted within the central structure, a plurality of engines, each engine including a reciprocative piston and a crankshaft driven thereby, the engines being connected with the central structure so that the crankshafts are connected with the drlveshaft and spaced thereabout through more than 180 and the pistons reciprocate along lines all on one side of a. given line and away from the given line when considered in directions from the crankshafts to the respective pistons.

6. A multiple unit power plant comprising a central structure, first and second engines secured to and extending outwardly from one side of the central structure in generally parallel relation, third and fourth engines secured to and extending outwardly from the opposite side of the central structure in generally parallel relation, the first and third engines being directly opposite one another and being relatively closely spaced, the second and fourth engines being directly opposite one another and being relatively widely spaced, and a fifth engine extendin from a region of the central structure located generally between the second and fourth engines and on the side away from the first and third engine, a. drive shaft mounted in the centra1 structure, and means drivingly connecting the engines with the drive shaft.

HARRY T. WOOLSON. MELBOURNE L. CARPENTER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Certificate of Correction Patent No. 2,419,305.

Number Name Date 1,354,535 Cofi'man Oct. 5, 1920 1,815,868 Schenk July 21, 1931 2,115,660 Yingling Apr. 26, 1938 1,933,292 Woolson Oct. 31, 1933 1,912,507 Woolson June 6, 1933 2,310,220 De Michelis Feb. 9, 1943 1,031,131 MacFarren July 2, 1912 1,101,308 Mcsweeney June 23, 1914 1,466,321 Whitcomb Aug. 28, 1923 FOREIGN PATENTS Number Country Date 123,229 British 1919 392,282 British 1933 675,425 French 1930 842,773 French 1939 533,491 French 1922 April 22, 1947.

HARRY T. WOOLSON ET AL. It is hereby certified that error appears in the rinted specification of the above numbered patent requiring correction as follows:

olumn 5, line 62, after the word brid ed insert by; and that the said Letters Patent should be read with this correcrtion t crew that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 12th day of August, A. D. 1947.

LESLIE FRAZER,

First Assistant Oommiast'oner of Patents. 

